An open question with many variables. However, quality cameras such as Leica, Nikon, Hasselblad, etc in all probability will go up in price if film remains a choice, Due in part to attrition of supply due to floods, dropping, being run over, and all other disasters that can befall camera equipment. Also, lack of replacement parts. It seems that almost every camera design has a weakness, so that the same part tends to fail for any given model.
However, I would not hoard cameras as a future investment. Also, mechanical film cameras require a craftsmanship no longer available, so don’t expect any new cameras to be produced. But so many high end cameras were bought as a fashion accessory by so many were heeled lawyers, physicians and others, that there are still a lot of like new forgotten cameras to be minded from drawers and closets.